We investigated gain and lasing in spin-coated films of a soluble substituted oligothiophene. With increasing excitation power, the photoluminescence spectra show a clear line narrowing due to amplified spontaneous emission. We measure a low threshold (20 J cm 2) for line narrowing and a large gain cross section (6×10 16 cm2), indicating that this molecule is a promising active material for organic solid-state lasers. As a demonstrator, we realize a transverse electromagnetic (TEM00) single-mode laser with tunable emission from the yellow to the red (a range of 37 nm), with a pump threshold as low as 18 J cm 2 and efficiency of 1.9%. These results are among the best so far reported for organic lasers.
Amplified spontaneous emission and efficient tunable laser emission from a substituted thiophene-based oligomer
PISIGNANO, Dario;ANNI, Marco;GIGLI, Giuseppe;CINGOLANI, Roberto;
2002-01-01
Abstract
We investigated gain and lasing in spin-coated films of a soluble substituted oligothiophene. With increasing excitation power, the photoluminescence spectra show a clear line narrowing due to amplified spontaneous emission. We measure a low threshold (20 J cm 2) for line narrowing and a large gain cross section (6×10 16 cm2), indicating that this molecule is a promising active material for organic solid-state lasers. As a demonstrator, we realize a transverse electromagnetic (TEM00) single-mode laser with tunable emission from the yellow to the red (a range of 37 nm), with a pump threshold as low as 18 J cm 2 and efficiency of 1.9%. These results are among the best so far reported for organic lasers.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
